Equipment for producing medical PTFE (Polytetrafluoroethylene) catheter by coating method

Abstract

The utility model discloses medical PTFE (Polytetrafluoroethylene) catheter coating method production equipment, which comprises a mandrel unwinding mechanism, a coating device, a coating device, a coating device and a coating device, and is characterized in that the mandrel unwinding mechanism is used for unwinding mandrels; the emulsion coating device is of a vertical structure; pTFE (Polytetrafluoroethylene) emulsion is arranged in the emulsion coating device, so that the core shaft moving in the vertical direction is uniformly coated with the PTFE emulsion; the vertical curing device is used for performing high-temperature curing molding on the PTFE emulsion coated on the mandrel; the tensioning mechanism is used for tensioning the mandrel; and the winding mechanism is used for winding the core shaft on which the PTFE pipe layer is formed. According to the device, micron-sized ultrathin medical PTFE catheter products can be obtained, the concentricity of the catheter can be improved, the production efficiency is high, continuous coating can be carried out, and the obtained catheter products are high in dimensional stability.

Description

Technical Field

[0001] The utility model relates to the technical field of medical catheter production, in particular to a medical PTFE catheter coating production device. Background Art

[0002] Medical catheters are a general term for tubular products that connect the inside and outside of the human body. They are widely used as pathways in drainage, perfusion, drug administration, blood collection, blood transmission, detecting the condition of organisms through sensing elements, and assisting in the introduction of other medical devices. Polytetrafluoroethylene (PTFE) is a low-friction material with high-temperature stability, good chemical corrosion resistance and biocompatibility, which is widely used in the medical field. At present, some medical scenarios require high-precision micron-level medical catheters, and high quality requirements are placed on the catheters. Therefore, there is a need for a production equipment and production method that can produce micron-level high-quality medical catheters.

[0003] Existing medical catheter production methods generally use extrusion molding equipment and extrusion molding processes. For example, Chinese patent CN215661719U discloses a medical catheter production line, which includes a controller and an extruder, a mold, a vacuum shaping cooling water tank, a caliper, a tractor, and a winder arranged in sequence from front to back. The production process is as follows: the material enters the extruder for plasticization and extrusion, and is extruded into a medical catheter through the mold. The medical catheter enters the vacuum shaping cooling water tank for sizing and cooling. After the medical catheter is pulled out of the vacuum shaping cooling water tank, it enters the caliper for sizing, and is then pulled by the tractor. The medical catheter that exits the tractor enters the winder for winding. The existing extrusion molding process has a large extrusion wall thickness and cannot be used to produce medical catheter products with a micron-level diameter. In addition, it is a horizontal production method, and the concentricity of the product cannot meet high requirements. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a medical PTFE catheter coating production equipment, which can obtain ultra-thin medical PTFE catheter products at the micron level, improve the concentricity of the catheter, have high production efficiency, can perform continuous coating, and the obtained catheter products have high dimensional stability.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A medical PTFE catheter coating production equipment, comprising:

[0007] A mandrel unwinding mechanism, used for unwinding the mandrel;

[0008] The emulsion coating device is a vertical structure; the emulsion coating device is provided with PTFE emulsion to evenly coat the mandrel moving in the vertical direction with the PTFE emulsion;

[0009] A vertical curing device is used to perform high-temperature curing and molding of the PTFE emulsion coated on the mandrel;

[0010] An etching device, which is arranged behind the vertical curing device and is used to etch the core shaft formed with the PTFE tube layer;

[0011] An ultrasonic cleaning device, used for ultrasonically cleaning the mandrel formed with the PTFE tube layer;

[0012] A tensioning mechanism, used for tensioning the mandrel;

[0013] The winding mechanism is used for winding the core shaft formed with the PTFE tube layer.

[0014] Furthermore, the mandrel unwinding mechanism also includes a winding disk and a material unwinding guide wheel group, the mandrel is wound on the winding disk, and the material unwinding guide wheel group guides the mandrel unwinded from the winding disk.

[0015] Furthermore, the equipment also includes an etching device, which is arranged behind the vertical curing device and is used to etch the core shaft formed with the PTFE tube layer.

[0016] Furthermore, the equipment also includes an ultrasonic cleaning device, which is used to ultrasonically clean the core shaft formed with the PTFE tube layer.

[0017] Furthermore, the emulsion coating device is a cylindrical structure, which includes an outer cylinder and an inner liner, an insulation space is provided between the outer cylinder and the inner liner, and constant temperature circulating water is injected into the insulation space; the PTFE emulsion is placed in the inner liner; the emulsion coating device has a core shaft inlet and a core shaft outlet communicated with the inner liner, and the core shaft entering through the core shaft inlet of the emulsion coating device enters the inner liner, passes through the PTFE emulsion, and is discharged through the core shaft outlet.

[0018] Furthermore, the tensioning mechanism includes an unwinding tensioning wheel group and a winding tensioning wheel group.

[0019] Furthermore, the device also includes a detection module, which includes a high-frequency spark machine, a wire diameter meter and a concave-convex detector.

[0020] Furthermore, a guide wheel set is provided above the vertical curing device to guide the core shaft formed with the PTFE tube layer downward.

[0021] Furthermore, the winding mechanism includes a winding guide wheel and a winding roller; under the guidance of the winding guide wheel, the core shaft formed with the PTFE tube layer is wound via the winding roller.

[0022] Furthermore, the core shaft is a silver-plated copper wire.

[0023] The method for producing a medical PTFE catheter using the above-mentioned equipment comprises the following steps:

[0024] S1, the mandrel unwinding mechanism releases the mandrel, and the mandrel is tensioned by the tensioning mechanism during the movement;

[0025] S2, the mandrel moves in a vertical direction and passes through the PTFE emulsion in the emulsion coating device. During the movement of the mandrel, the PTFE emulsion is evenly coated on the mandrel;

[0026] S3, the mandrel coated with PTFE emulsion enters the vertical curing device and undergoes high-temperature curing and molding treatment;

[0027] S4, the core shaft formed with the PTFE tube layer is sequentially subjected to etching treatment and ultrasonic cleaning; the etching treatment can increase the roughness of the surface of the tube layer, thereby increasing the structural reliability of the reinforcement layer woven by the PTFE catheter in subsequent processes;

[0028] S5, the core shaft with the PTFE tube layer formed thereon is rolled up by a rolling mechanism.

[0029] The beneficial effects of the utility model are:

[0030] The utility model innovatively designs a medical PTFE catheter coating production equipment, which produces medical PTFE catheters by combining vertical coating and curing molding. Compared with existing extrusion molding equipment and processes, ultra-thin precision PTFE catheters with a wall thickness of 5-15μm can be obtained, which can meet high-precision application requirements, improve the concentricity of the catheter, and improve product quality.

[0031] The utility model adopts a coating device with a vertical structure in the vertical coating process. The coating device is provided with PTFE emulsion. The core shaft moves in a vertical direction and passes through the coating device to continuously coat the PTFE emulsion. Compared with the horizontal production process, the concentricity deviation problem can be avoided, the concentricity of the catheter product can be improved, and the product quality can be improved.

[0032] The equipment of the utility model has high production efficiency, can continuously coat a core shaft of more than 2 kilometers, and the obtained catheter product has high dimensional stability, and can save raw materials, reduce production costs, and improve production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the structure of a medical PTFE catheter coating production equipment according to an embodiment of the utility model.

[0034] Figure 2 This is a structural schematic diagram from another perspective of the medical PTFE catheter coating production equipment of an embodiment of the utility model.

[0035] Figure 3 It is a structural schematic diagram of the emulsion coating device in the medical PTFE catheter coating production equipment according to an embodiment of the utility model.

[0036] In the figure, 1: mandrel unwinding mechanism, 11: coiling disc, 12: unwinding guide wheel, 13: unwinding cabinet; 2: emulsion coating device, 21: outer cylinder, 22: inner tank, 23: quantitative liquid supply port, 24: waste liquid discharge port, 25: constant temperature circulating water inlet, 26: constant temperature circulating water outlet; 3: vertical curing device, 31: guide wheel group; 4: etching device; 5: ultrasonic cleaning device; 6: tensioning mechanism, 61: unwinding tensioning wheel, 62: winding tensioning wheel; 7: detection module, 71: high frequency spark machine, 72: wire diameter meter, 73: bump detector; 8: winding mechanism, 81: winding guide wheel, 82: winding roller; 9: middle guide wheel; 10: mandrel; 20: electric cabinet. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0038] like Figures 1 to 3 The medical PTFE catheter coating production equipment shown includes a core shaft unwinding mechanism 1, an emulsion coating device 2, a vertical curing device 3, an etching device 4, an ultrasonic cleaning device 5, a tensioning mechanism 6, a detection module 7 and a winding mechanism 8.

[0039] Specifically, the mandrel unwinding mechanism 1 includes a coil tray 11 and a material unwinding guide wheel group installed on the unwinding cabinet. A mandrel 10 is wound on the coil tray 11. The coil tray 11 is driven to rotate by a motor installed in the unwinding cabinet 13. The material unwinding guide wheel group includes a plurality of material unwinding guide wheels 12. The mandrel released by the rotation of the coil tray 11 changes from horizontal direction to vertical direction after being guided by the material unwinding guide wheel 12.

[0040] The emulsion coating device 2 is a vertical structure; the emulsion coating device 2 is provided with PTFE emulsion to evenly coat the mandrel 10 moving in the vertical direction with the PTFE emulsion; more specifically, as Figure 3As shown, the emulsion coating device 2 is a cylindrical structure, which includes an outer cylinder 21 and an inner liner 22. The inner liner 22 is a circular tubular structure, which is arranged at the center of the outer cylinder 21. The emulsion coating device 2 is provided with a quantitative liquid supply port 23, a waste liquid discharge port 24, a constant temperature circulating water inlet 25, and a constant temperature circulating water outlet 26; the inner cavity of the inner liner 22 is injected with PTFE emulsion introduced through the quantitative liquid supply port; an insulation space is provided between the outer cylinder 21 and the inner liner 22, and constant temperature circulating water is injected into the insulation space through the constant temperature circulating water inlet 25; the constant temperature circulating water inlet 25, the constant temperature circulating water outlet 26 cooperate with the external constant temperature water supply equipment to realize the water supply cycle of the constant temperature circulating water. The constant temperature circulating water can ensure the temperature of the PTFE emulsion in the inner liner. The emulsion coating device 2 is also connected to a water temperature sensor to monitor the temperature of the constant temperature circulating water.

[0041] The emulsion coating device 2 has a mandrel inlet and a mandrel outlet communicated with the inner container, and the mandrel entering through the mandrel inlet of the emulsion coating device 2 enters the inner container 2, passes through the PTFE emulsion and is then led out through the mandrel outlet. A sealing structure (not shown in the figure) is provided at the mandrel inlet to prevent leakage of the PTFE emulsion.

[0042] The vertical curing device 3 is arranged above the emulsion coating device 2, and includes multiple curing furnaces for high-temperature curing and molding the PTFE emulsion coated on the core shaft; a guide wheel group 31 is provided above the vertical curing device 3 to guide the core shaft with the PTFE tube layer molded thereon downward.

[0043] After being guided downward, the mandrel passes through the middle guide wheel 9 located in front of the etching device 4 and then enters the etching device 4 located behind the vertical curing device horizontally. The etching tank of the etching device 4 is provided with an etching liquid for etching the surface of the molded PTFE tube layer on the mandrel. The purpose of etching is to increase the roughness of the PTFE tube layer. In order to increase the strength of the medical PTFE catheter in the subsequent process, a reinforcing braided layer is generally woven on the catheter. After increasing the roughness of the surface of the PTFE catheter through the etching process, the reliability of the reinforcing braided layer can be improved, thereby further improving the strength of the medical catheter.

[0044] The device also includes an ultrasonic cleaning device 5 located behind the etching device 4; the ultrasonic cleaning device 5 is used to ultrasonically clean the core shaft formed with the PTFE tube layer. The ultrasonic cleaning device includes an ultrasonic generator, a cleaning agent cleaning area, a pure water cleaning area and a blow-drying area. The ultrasonic wave generated by the ultrasonic generator is transmitted to the cleaning agent cleaning area and the pure water cleaning area to realize ultrasonic cleaning. The ultrasonic cleaning device is a conventional device, and its specific structure is not described in detail here.

[0045] The tensioning mechanism 6 includes an unwinding tensioning wheel set and a winding tensioning wheel set. The unwinding tensioning wheel set includes a plurality of unwinding tensioning wheels 61 installed on the unwinding tensioning cabinet, and the winding tensioning wheel set includes a plurality of winding tensioning wheels 62 installed on the winding tensioning cabinet. The unwinding tensioning wheel set is driven by a motor to rotate to tension the released mandrel so as to facilitate vertical coating, etching and ultrasonic cleaning of the mandrel, and the winding tensioning wheel set is driven by a motor to rotate to tension the mandrel formed with a PTFE tube layer before winding.

[0046] The device also includes a detection module 7, which includes a high-frequency spark machine 71, a wire diameter gauge 72 and a concave-convex detector 73. The high-frequency spark machine 71 is used to detect whether the coated and cured PTFE tube layer has defects such as pinholes, air gaps, cracks, etc., the wire diameter gauge 72 is used to detect whether the diameter of the PTFE tube meets the requirements, and the concave-convex detector 73 is used to detect whether the coated and cured PTFE tube layer has bulges.

[0047] The winding mechanism 8 is used to wind up the core shaft with the PTFE tube layer. The winding mechanism includes a winding guide wheel 81 and a winding roller 82; the winding roller 83 is driven by a motor to rotate; under the guidance of the winding guide wheel 81, the core shaft with the PTFE tube layer is wound up by the winding roller 82 after passing through the detection module 7.

[0048] The device of the present invention further comprises an electric cabinet 20 for controlling various mechanisms, devices and modules in the device.

[0049] The method for producing a medical PTFE catheter by a vertical coating method using the above-mentioned equipment comprises the following steps:

[0050] The coiling disc in the mandrel unwinding mechanism 1 unwinds the mandrel 10 by rotating, and then moves from the horizontal direction to the vertical direction after being guided by the unwinding guide wheel 12; the mandrel 10 is tensioned by the tensioning mechanism 6 during the movement;

[0051] The mandrel 10 moves in a vertical direction and passes through the PTFE emulsion in the emulsion coating device 2. During the movement of the mandrel, the PTFE emulsion is evenly coated on the mandrel 10.

[0052] The mandrel 10 coated with PTFE emulsion enters the vertical curing device 3 and undergoes high-temperature curing and molding treatment;

[0053] The core shaft formed with the PTFE tube layer is sequentially etched by the etching device 4 and cleaned by the ultrasonic cleaning device 5;

[0054] The core shaft formed with the PTFE tube layer is inspected by the inspection module 7;

[0055] The core shaft formed with the PTFE tube layer is a semi-finished PTFE catheter, which is rolled up by the rolling mechanism 8 .

[0056] Medical PTFE catheters can be obtained by using a core-pulling device to pull out the mandrel (clamp the two ends of the PTFE catheter semi-finished product, and pull the mandrel out by the electric cylinder). When pulling out the core, the PTFE catheter semi-finished product can be cut into shorter lengths before pulling out the mandrel.

[0057] It should also be noted that the core shaft in the present invention is generally made of silver-plated copper wire.

[0058] The wall thickness of the PTFE catheter obtained by the utility model is 5-15 μm, which can meet the application requirements of micron-level medical catheters.

[0059] The utility model innovatively designs a medical PTFE catheter coating production equipment, which produces medical PTFE catheters by combining vertical coating and curing molding. Compared with existing extrusion molding equipment and processes, ultra-thin precision PTFE catheters with a wall thickness of 5-15μm can be obtained, which can meet high-precision application requirements, improve the concentricity of the catheter, and improve product quality.

[0060] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A medical PTFE catheter coating production equipment, characterized in that: include: A mandrel unwinding mechanism, used for unwinding the mandrel; The emulsion coating device is a vertical structure; the emulsion coating device is provided with PTFE emulsion to evenly coat the mandrel moving in the vertical direction with the PTFE emulsion; A vertical curing device is used to perform high-temperature curing and molding of the PTFE emulsion coated on the mandrel; A tensioning mechanism, used for tensioning the mandrel; The winding mechanism is used for winding the core shaft formed with the PTFE tube layer.

2. A medical PTFE catheter coating production equipment according to claim 1, characterized in that, The mandrel unwinding mechanism comprises a coiling disc and a material unwinding guide wheel set, a mandrel is wound on the coiling disc, and the material unwinding guide wheel set guides the mandrel unwinded from the coiling disc.

3. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The equipment also includes an etching device, which is arranged behind the vertical curing device and is used for etching the core shaft formed with the PTFE tube layer.

4. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The equipment also includes an ultrasonic cleaning device, which is used for ultrasonically cleaning the core shaft formed with the PTFE tube layer.

5. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The emulsion coating device is a cylindrical structure, which includes an outer cylinder and an inner liner, an insulation space is provided between the outer cylinder and the inner liner, and constant temperature circulating water is injected into the insulation space; the PTFE emulsion is placed in the inner liner; the emulsion coating device has a core shaft inlet and a core shaft outlet communicated with the inner liner, and the core shaft entering through the core shaft inlet of the emulsion coating device enters the inner liner, passes through the PTFE emulsion and is discharged through the core shaft outlet.

6. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The tensioning mechanism comprises an unwinding tensioning wheel set and a winding tensioning wheel set.

7. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: It also includes a detection module, which includes a high-frequency spark machine, a wire diameter meter and a concave-convex detector.

8. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: A guide wheel set is arranged above the vertical curing device to guide the core shaft formed with the PTFE tube layer downward.

9. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The winding mechanism comprises a winding guide wheel and a winding roller; under the guidance of the winding guide wheel, the core shaft formed with the PTFE tube layer is wound via the winding roller.

10. A medical PTFE catheter coating production equipment according to claim 1, characterized in that: The core shaft is a silver-plated copper wire.

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